Hydrogen Sorption Properties of the Complex Hydride Mg2FeH6 Consolidated by HPT
In the present work, we have processed 2MgFe mixtures by reactive milling (RM) under hydrogen atmosphere to synthesize Mg2FeH6 phase in the powder form which were then systematically processed by High Pressure Torsion (HPT) to produce bulk samples. The bulk samples were characterized in terms of microstructural and structural analyses and of hydrogen desorption properties. The hydrogen sorption properties after HPT processing was evaluated in comparison with the Mg2FeH6 powder obtained by RM and with commercial MgH2. HPT processing of Mg2FeHs can produce bulks with a high density of defects that drastically lower the activation barrier for hydrogen desorption. Therefore, the bulk nanocrystalline Mg2FeH6 samples show endothermic hydrogen decomposition peak at a temperature around 320℃. In addition, when compared with the Mg2FeHe and MgH2 powders, the Mg2FeH6 HPT disks showed the same results presented by the Mg2FeH6 powders and certainly decreases the onset transition temperature by as much as 160℃ when compared with the MgH2 powders.
G.F.De Lima D.R.Leiva T.T.Ishikawa C.Bolfarini C.S.Kiminami W.J.Botta A.M.Jorge Jr
Departamento de Engenharia de Materials,Universidade Federal de S3o Carlos,Sao Carlos,Brazil
国际会议
5th International Conference on Nanomaterials by Severe Plastic Deformation(第五届剧烈塑性变形纳米材料国际会议)
南京
英文
1053-1058
2011-03-01（万方平台首次上网日期，不代表论文的发表时间）